--- title: Rivers, lakes and the sea up close — a lesson of Mova's school · trees and pragmatics description: «Rivers, lakes and the sea up close», a lesson of the world course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A river collects water from all the land that slopes towards it, called its drainage basin; small streams called tributaries join it on t --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [World](https://md.mova.elamur.ai/free/en/corpora/school/world/) / Rivers, lakes and the sea up close # Rivers, lakes and the sea up close Lesson 64 of the world course of Mova's primary school: 17 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/world/64-rivers-lakes-and-the-sea/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/0/) — A river collects water from all the land that slopes towards it, called its drainage basin; small streams called tributaries join it on the way, so it grows bigger as it flows downhill. - [1](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/1/) — The line of high land between two basins is a watershed. - [3](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/3/) — Lakes form in hollows dug by glaciers, in craters of old volcanoes, in cracks where the crust pulled apart, or behind dams; Lake Baikal in Russia, in such a crack, is the deepest lake on Earth and holds about a fifth of all the fresh water in lakes and rivers. - [4](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/4/) — Only about 3 parts in 100 of all the water on Earth is fresh, and most of that is frozen in ice or hidden underground; the rest is salty ocean water. - [5](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/5/) — The sea is never still: waves are made by the wind, and tides, which raise and lower the sea twice a day, are made mostly by the pull of the Moon. - [6](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/6/) — Wetlands such as marshes and swamps soak up flood water like a sponge, clean the water, and are home to many birds, frogs and fish. - [7](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/7/) — A tributary is a smaller river or stream that flows into a bigger river. - [8](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/8/) — A drainage basin is all the land whose water drains into one river. - [9](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/9/) — A meander is a loop or bend in a river in its lower course. - [10](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/10/) — A floodplain is the flat land beside a river that is covered with water when the river floods. - [11](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/11/) — The Nile and the Amazon are the longest rivers in the world, and the Amazon carries by far the most water. - [13](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/13/) — About 97 parts in 100 of the Earth's water is salty sea water. - [14](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/14/) — Most of the Earth's fresh water is frozen in ice sheets and glaciers or lies underground. - [15](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/15/) — Waves on the sea are mostly made by the wind blowing over the water. - [16](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/16/) — Tides are caused mostly by the pull of the Moon's gravity on the oceans. - [17](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/17/) — The Dead Sea is a salty lake so salty that people float in it easily. - [18](https://md.mova.elamur.ai/free/en/corpora/school/world/64-rivers-lakes-and-the-sea/18/) — Wetlands soak up flood water and clean it. - ← previous: [Soil and what lives in it](https://md.mova.elamur.ai/free/en/corpora/school/world/63-soil-and-what-lives-in-it/) - next →: [Glaciers, ice ages and polar lands](https://md.mova.elamur.ai/free/en/corpora/school/world/65-glaciers-ice-ages-polar-lands/) - ↑ back to [World](https://md.mova.elamur.ai/free/en/corpora/school/world/)